The visual impression of the "black" is not only dependent on the reflectance but also on the hue. This can be determined using colorimetric methods. Considering the relative sensitivity of the cones in human eyes of a standard observer (2º or 10º field of view), in combination with a standard illuminant, all colours can be represented by three components, red, green and blue: tristimulus values, X, Y and Z. These values are the basis of the International Commission on Illumination (CIE) colorimetric system. The following colour calculations are based on a 10º observer and D65 illuminant. The CIE ...